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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
99/n = 99/100 // - 99/100
99/n-(99/100) = 0
99/n-99/100 = 0
99*n^-1 = 99/100 // : 99
n^-1 = 1/100
-1 < 0
1/(n^1) = 1/100 // * n^1
1 = 1/100*n^1 // : 1/100
100 = n^1
n = 100
n = 100
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